| 摘要 |
Apparatus is provided for welding studs to a workpiece with the area around the welds being substantially free of smut. The existence of the smut detracts from the appearance of the workpiece and if the workpiece is to be painted or otherwise covered with a coating material, the smut must first be removed. The coating of smut can be eliminated if, during the weld process, fluid is carefully deposited on the weld area around the end of the stud where the weld occurs. The fluid consists of a small volume of low-pressure air and an anti-smut liquid. The latter also helps to keep weld splatter from adhering to the interior of a spark shield used with the stud. However, by applying a non-metallic, preferably plastic, sleeve within the spark shield, the problem of splatter can be further reduced or substantially eliminated.
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